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X-WR-CALDESC:Events for Stewart Blusson Quantum Matter Institute
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SUMMARY:CM Seminar: Kamran Kamiri – National Centre for Nuclear Research\, Poland: Multiscale Modeling of Mechanical Deformation in Chemically Complex Alloys
DESCRIPTION:Kamran Kamiri – National Centre for Nuclear Research\, Poland\nTitle: Multiscale Modeling of Mechanical Deformation in Chemically Complex Alloys \nAbstract: In my presentation\, I will give an overview of three primary areas that have been my focal research interests at NOMATEN CoE: i) crystal and amorphous plasticity\, ii) transport properties of high-entropy alloys (HEAs)\, and iii) micro-structural informatics. In i)\, my research has employed statistical physics to unravel the microscopic basis of plasticity based on the collective dynamics of shear transformation zones in amorphous solids as well as dislocations mechanics in crystalline metals. Within the context of HEAs\, my focus has been on the role of chemical complexities (i.e. local disorder/ordering) investigating their impact on alloy strengths. In ii)\, I have explored the sluggish diffusion of defects in HEAs and its impact on thermo-mechanical properties. In the area of micro-structural informatics in iii)\, I have utilized the power of machine learning (ML) and graph neural networks GNNs to infer (hardness) properties solely based on the (surface) microstructural information. Building upon these achievements\, we are currently expanding the scope of the above studies by i) employing ML to identify relevant microstructural metrics for predicting bulk plastic properties in bulk metallic glasses as well as HEAs within the microstructure-property paradigm\, ii) utilizing machine-learned interatomic potentials for accelerated material discovery\, and iii) extending the GNN’s capabilities to infer microstructural signatures and defects based on micro/nano mechanical response (as input data) in different metallic systems and distinct alloy compositions. \nSpeaker Bio: Kamran Karimi is a computational materials physicist working at the National Centre for Nuclear Research\, Otwock Poland. \n 
URL:https://qmi.miffanytark.com/event/cm-seminar-kamran-kamiri-national-centre-for-nuclear-research-poland-multiscale-modeling-of-mechanical-deformation-in-chemically-complex-alloys/
CATEGORIES:CM Seminar
ORGANIZER;CN="Aditi Adhikari":MAILTO:aditi.adhikari@ubc.ca
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DTSTART;TZID=America/Vancouver:20240321T100000
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DTSTAMP:20240214T191126Z
CREATED:20240214T191126Z
LAST-MODIFIED:20240214T191126Z
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SUMMARY:CM Seminar: Janez Bonca – University of Ljubljana: Equilibrium and far-from-equilibrium properties of bipolaron coupled to dispersive phonons
DESCRIPTION:CM Seminar: Janez Bonca – University of Ljubljana\nTitle: Equilibrium and far-from-equilibrium properties of bipolaron coupled to  dispersive phonons \nAbstract: In the first part of my talk\, I will discuss  a Holstein-like model with two electrons nonlinearly coupled to quantum phonons. Using an efficient method based on full quantum approach [1-4] we  simulate the dynamical response of a system subject to a short spatially uniform optical pulse that couples to dipole-active vibrational modes. Nonlinear electron-phonon coupling can either soften or strengthen the phonon frequency in the presence of electron density [5]. When two electrons are free to propagate on a lattice subject to non-linear coupling to phonons that soften phonon frequency\, an external optical pulse with well tuned frequency can induce attraction between electrons. Electrons remain bound long after the optical pulse is switched off. Changing the frequency of the pulse the attractive electron–electron interaction can be switched to repulsive. Two sequential optical pulses with different frequencies can switch between attractive and repulsive interaction [6]. \nIn the second part\, I will discuss the phase diagram of the bipolaron in the Holstein – Hubbard model in the presence of dispersive phonons. We show that a finite dispersion can stabilize a bound bipolaron even at large Coulomb repulsion U [7]. The sign of the curvature of the optical phonon dispersion plays a decisive role on the bipolaron binding energy and the effective mass in the presence of  U. Finally\, I will discuss the influence of U on the ARPES spectral function of the bipolaron. \nSpeaker Bio: Janez Bonca is a Professor and Dean of the Faculty of Mathematics and Physics at the University of Ljubljana\, Slovenia.  His research interests include theory of incommensurate systems\, theory of strongly correlated systems and high temperature superconductors\, theory of heavy fermion systems\, theory of mesoscopic systems and quantum dots\, theory of frustrated spin systems\, physics of electron – phonon interaction and theory of polarons and bipolarons\, study of systems driven far from equilibrium\, thermalization in many-body systems\, theory of many-body localization. Prof. Bonca completed his PhD from the University of Ljubljana\, and worked as a Post-doctoral Associate at  Los Alamos National Laboratory from 1992-1995. \n 
URL:https://qmi.miffanytark.com/event/cm-seminar-janez-bonca-university-of-ljubljana-equilibrium-and-far-from-equilibrium-properties-of-bipolaron-coupled-to-dispersive-phonons/
CATEGORIES:CM Seminar
ORGANIZER;CN="Aditi Adhikari":MAILTO:aditi.adhikari@ubc.ca
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DTSTART;TZID=America/Vancouver:20240328T100000
DTEND;TZID=America/Vancouver:20240328T110000
DTSTAMP:20240325T203553Z
CREATED:20240325T203553Z
LAST-MODIFIED:20240325T203553Z
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SUMMARY:CM Seminar: John Sous – University of California San Diego: Principles for phonon-driven energy solutions in functional electronic materials
DESCRIPTION:CM Seminar: John Sous – University of California San Diego\nTitle: Principles for phonon-driven energy solutions in functional electronic materials \nAbstract: Functional electronic materials are compounds in which correlations amongst electrons and between electrons and ionic vibrations (phonons) give rise to promising new functionalities poised to revolutionize energy conversion\, storage and sustainability. In this talk\, I will present principles – that extend the textbook understanding of electron-phonon coupling –  for the design of phonon-driven pathways to electronic materials with energy capabilities\, thereby opening a door to new advancements in the materials and energy sciences. I will discuss three examples: 1. Energy conversion in so-called polaronic crystals such as the organic oligo-acene molecules\, where I will show that the concept of a polaron becomes very quickly ill-defined as temperature increases from zero\, implying that energy absorption and conversion cannot be understood in terms of quasiparticle transport\, with ramifications to emerging solar cell technologies. 2. Energy storage in nanoscale materials whose phonons are initially excited by a light pulse\, where I will show that the excited phonons relax by releasing their excess energy into the electrons\, reshaping their correlations to form novel excited-state non-equilibrium phases such as the light-induced conversion of metals into disordered insulators and (near) superconductors which appear to be immune to thermalization on long timescales\, thus serving as new mediums for protected energy storage and utilization. 3. Energy sustainability from vibrationally coupled electrons in multiorbital electronic materials\, where I will show that phonons mediate superfluidity of light-mass\, small-size bipolarons with a critical transition temperature Tc whose value vastly surpasses widely assumed empirical upper bounds and which I am currently investigating in a number of emerging materials such as the newly synthesized organic terphenyl-based compounds\, SrTiO3\, LiTi2O4\, as well as twisted bilayer graphene moire heterostructures. I will conclude by providing an overview of my future plans. \nSpeaker Bio: John Sous is an Assistant Professor at the University of California\, San Diego (UCSD).  Prior to that he was a Gordon & Betty Moore Postdoctoral Fellow at Stanford University (2022 – 2023)\, before which he was a Materials Research Science and Engineering Center (MRSEC) Postdoctoral Fellow at Columbia University (2019 – 2022). He obtained a Ph.D. in Physics from the University of British Columbia (UBC) in 2019 and a M.Sc. in Chemical Physics from the University of Waterloo in 2013. His research focuses on the study of materials in which quantum correlations act to stabilize novel electronic states of matter with functionalities which can be useful in applied research\, such as energy applications. \n  \n 
URL:https://qmi.miffanytark.com/event/cm-seminar-john-sous-university-of-california-san-diego-principles-for-phonon-driven-energy-solutions-in-functional-electronic-materials/
CATEGORIES:CM Seminar
ORGANIZER;CN="Aditi Adhikari":MAILTO:aditi.adhikari@ubc.ca
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